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Old 11-10-2011, 01:50 PM   #1
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3208 T, Engine RPM

What are the reccomendations for running the 3208 T engines? 1500 RPM delivers 9knots for me...but what is the best fuel consumption for the speed?

We have a 1980 38 californian
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Old 11-11-2011, 03:40 AM   #2
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RE: 3208 T, Engine RPM

."but what is the best fuel consumption for the speed?"

Usually the sq rt of the lwl times .9 to 1.15 is the lowest cost lowest fuel burn speed.

That's why so many "trawlers" run 6-7K

Weather ypur turbo will allow such low speeds will depend on your installation.

You should have positive boost , at least 1 pound to not harm the engine .
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Old 10-19-2015, 10:37 PM   #3
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Can't help you with the rpm.
However I am interested in who make the transmission for the 3208?
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Old 10-19-2015, 11:42 PM   #4
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Mine is a twin disc. Don't think there is a "the" transmission.
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Old 10-19-2015, 11:46 PM   #5
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Here is some information. Hope it helps.


https://marine.cat.com/cda/files/101...Propulsion.pdf
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Old 10-20-2015, 09:26 AM   #6
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Quote:
Originally Posted by FF View Post
."but what is the best fuel consumption for the speed?"

Usually the sq rt of the lwl times .9 to 1.15 is the lowest cost lowest fuel burn speed.

That's why so many "trawlers" run 6-7K

Weather ypur turbo will allow such low speeds will depend on your installation.

You should have positive boost , at least 1 pound to not harm the engine .
Where does this 1psi of boost limit come from? Never heard of such a thing. If engine load does not require boost, turbo will happily idle along without harm.
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Old 10-20-2015, 09:35 AM   #7
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Agreed as long as the engine gets to proper operating temp dont worry about boost or other myths.


Best fuel consumption vs speed will be at a speed that keeps the bow down. any excessive wave making is wasting fuel. Forget all the math and find the speed where your boat doesn't make waves. Notice that this has nothing to do with rpm, engine make or specifications just your hull moving as fast as possible while making the least water disturbance.
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Old 10-20-2015, 10:01 AM   #8
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Agreed as long as the engine gets to proper operating temp dont worry about boost or other myths.


Best fuel consumption vs speed will be at a speed that keeps the bow down. any excessive wave making is wasting fuel. Forget all the math and find the speed where your boat doesn't make waves. Notice that this has nothing to do with rpm, engine make or specifications just your hull moving as fast as possible while making the least water disturbance.
Many (most?) turbocharged engines have a lower compression ratio than NA. I believe the "on boost" recommendation probably stems from this with the thought that if the turbo is providing pressure, then the combustion process is probably more complete and internal temperatures are more likely to be where they should be. The turbo engines in our boat do not reach normal operating temperature when idling along at 35 HP per side @ 9 KTS.
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Old 10-20-2015, 10:37 AM   #9
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Gad. Four year old thread. Just noticed that.
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